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Set update panel trigger to the control which is inside gridview

I have a grid view which is inside Update Panel(UpdatePanel1) and there is also a second grid view which is inside another Update Panel(UpdatePanel2).Update Panel(UpdatePanel1) is triggered by the outside controls and i want to trigger the Update Panel(UpdatePanel2)
on the check change event of Checkbox which is inside Gridview and this GridView is inside Update Panel(UpdatePanel1). I use the following code but this also didn't work